Difference between Facade and Mediator Design pattern?

What is the difference between facade and mediator design pattern. I want understand which design pattern to choose between these two in which scenario. I was going through the following links and found both same in terms of use case.

Facade design pattern : http://ift.tt/1dxnSWy

Mediator design pattern : http://ift.tt/1HsyGkV

I have confusion in following code segment which looks similar in both the design patterns.

** Facade class :** public class ShapeMaker { private Shape circle; private Shape rectangle; private Shape square;

   public ShapeMaker() {
      circle = new Circle();
      rectangle = new Rectangle();
      square = new Square();
   }

   public void drawCircle(){
     circle.draw();
   }
   public void drawRectangle(){
     rectangle.draw();
   }
   public void drawSquare(){
     square.draw();
   }
}



**Mediator class :** 

   public class Mediator {
         Welcome welcome;
         Browse browse;
         Purchase purchase;
         Exit exit;

        public Mediator() {
          welcome = new Welcome(this);
          browse = new Browse(this);
          purchase = new Purchase(this);
          exit = new Exit(this);
       }

      public void handle(String state) {
          if (state.equals("welcome.shop")) {
            browse.execute();
      } else if (state.equals("shop.purchase")) {
            purchase.execute();
      } else if (state.equals("purchase.exit")) {
             exit.execute();
      }